### Basic WebService Setup and Route Definition

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/emicklei/go-restful/README.md

Demonstrates how to initialize a WebService, set its path and content types, and define a GET route with a path parameter. This is a foundational example for setting up API endpoints.

```Go
ws := new(restful.WebService)
ws.
	Path("/users").
	Consumes(restful.MIME_XML, restful.MIME_JSON).
	Produces(restful.MIME_JSON, restful.MIME_XML)

ws.Route(ws.GET("/{user-id}").To(u.findUser).
	Doc("get a user").
	Param(ws.PathParameter("user-id", "identifier of the user").DataType("string")),
	Writes(User{}))
```

--------------------------------

### Go Get Installation

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/dsnet/compress/README.md

Install the compression library using the Go get command. Requires Go 1.9 or higher.

```bash
go get -u github.com/dsnet/compress
```

--------------------------------

### Install pb.v1 Package

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/gopkg.in/cheggaaa/pb.v1/README.md

Install the pb.v1 package using the go get command.

```bash
go get gopkg.in/cheggaaa/pb.v1
```

--------------------------------

### Install go-metrics

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/rcrowley/go-metrics/README.md

Command to install the go-metrics library using go get.

```sh
go get github.com/rcrowley/go-metrics
```

--------------------------------

### Install GoDotEnv as a Library

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/joho/godotenv/README.md

Install the GoDotEnv library using the go get command.

```shell
go get github.com/joho/godotenv
```

--------------------------------

### Install GoDotEnv as a Binary

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/joho/godotenv/README.md

Install the GoDotEnv command-line tool using the go get command.

```shell
go get github.com/joho/godotenv/cmd/godotenv
```

--------------------------------

### Install etcd/clientv3

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/coreos/etcd/clientv3/README.md

Install the etcd/clientv3 Go package using the go get command.

```bash
go get github.com/coreos/etcd/clientv3
```

--------------------------------

### Install bbolt

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/coreos/bbolt/README.md

Install the bbolt library and command-line utility using go get.

```sh
go get github.com/coreos/bbolt/...
```

--------------------------------

### Install Diskv using Go Get

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/operator/vendor/github.com/peterbourgon/diskv/README.md

Installs the diskv package using the Go build tool. Ensure Go is installed first.

```bash
$ go get github.com/peterbourgon/diskv
```

--------------------------------

### Install NUID

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/nats-io/nuid/README.md

Use the go get command to install the NUID library.

```bash
	$ go get github.com/nats-io/nuid
```

--------------------------------

### Install Mergo

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/operator/vendor/github.com/imdario/mergo/README.md

Use 'go get' to install the Mergo library. Then, import it into your Go code.

```go
go get github.com/imdario/mergo

// use in your .go code
import (
    "github.com/imdario/mergo"
)
```

--------------------------------

### Install go-codec Library

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/hashicorp/go-msgpack/codec/README.md

Install the go-codec library using the go get command. This command fetches and installs the specified package and its dependencies.

```bash
go get github.com/ugorji/go/codec
```

--------------------------------

### Complete Runnable Mux Server Example

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/operator/vendor/github.com/gorilla/mux/README.md

Provides a full, runnable example of a small HTTP server using Gorilla Mux.

```go
package main

import (
    "net/http"
    "log"
    "github.com/gorilla/mux"
)

func YourHandler(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("Gorilla!\n"))
}

func main() {
    r := mux.NewRouter()
    // Routes consist of a path and a handler function.
    r.HandleFunc("/", YourHandler)

    // Bind to a port and pass our router in
    log.Fatal(http.ListenAndServe(":8000", r))
}
```

--------------------------------

### Install pgzip

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/klauspost/pgzip/README.md

Install the pgzip library using the go get command. You may also need to update its dependency.

```go
go get github.com/klauspost/pgzip/...

```

```go
go get -u github.com/klauspost/compress
```

--------------------------------

### Install json-iterator/go

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/operator/vendor/github.com/json-iterator/go/README.md

Install the json-iterator/go library using the go get command.

```go
go get github.com/json-iterator/go
```

--------------------------------

### Initialize Helm and Install GitLab

Source: https://github.com/dotmesh-io/dotmesh/blob/master/kubernetes/gke-demo.md

Initialize the Helm package manager, add the GitLab Helm repository, and install GitLab using a custom values file.

```bash
helm init
helm repo add gitlab https://charts.gitlab.io
helm install --namespace gitlab --name gitlab -f gitlab/helm/values.yaml gitlab/gitlab
```

--------------------------------

### Install etcd/client Go Package

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/coreos/etcd/client/README.md

Use 'go get' to install the etcd client library. This command fetches and installs the package, making it available for import in your Go projects.

```bash
go get github.com/coreos/etcd/client
```

--------------------------------

### Setup Discovery Service

Source: https://github.com/dotmesh-io/dotmesh/blob/master/docs/dev-commands.md

Clones the discovery.dotmesh.io repository and starts a local discovery service. This is necessary for running tests offline.

```bash
cd ~/ 
git clone git@github.com:dotmesh-io/discovery.dotmesh.io
cd discovery.dotmesh.io
./start-local.sh
```

--------------------------------

### Install blang/semver

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/blang/semver/README.md

Install the library using go get. It is recommended to vendor dependencies or fix on a specific version tag.

```bash
$ go get github.com/blang/semver
```

--------------------------------

### Install Bolt DB

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/boltdb/bolt/README.md

Install Bolt DB and its command-line utility using go get.

```sh
$ go get github.com/boltdb/bolt/...
```

--------------------------------

### Install Cobra Library

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/spf13/cobra/README.md

Install the latest version of the Cobra library using go get.

```bash
> go get -v github.com/spf13/cobra/cobra
```

--------------------------------

### Install ugorji/go/codec

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/ugorji/go/codec/README.md

Install the codec library using go get. Use the 'unsafe' tag to enable bypassing allocation and copying overhead for byte to string conversions during decoding.

```bash
go get github.com/ugorji/go/codec
```

```bash
go install -tags=unsafe github.com/ugorji/go/codec
```

--------------------------------

### Install XZ Package

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/xi2/xz/README.md

Download and install the XZ package using the Go tool.

```bash
go get github.com/xi2/xz
```

--------------------------------

### Install Semver Library

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/blang/semver/README.md

Use 'go get' to install the semver library. It's recommended to vendor dependencies or fix to a specific version tag.

```bash
go get github.com/blang/semver
```

--------------------------------

### Install gRPC-Go Package

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/google.golang.org/grpc/README.md

Installs the gRPC-Go library using the go get command. Requires Go and a configured Go workspace.

```bash
$ go get -u google.golang.org/grpc
```

--------------------------------

### Install Gorilla Mux

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/operator/vendor/github.com/gorilla/mux/README.md

Install the gorilla/mux package using the go get command. Ensure your Go toolchain is correctly configured.

```go
go get -u github.com/gorilla/mux
```

--------------------------------

### Ubuntu 18.04 Setup for Dotmesh Development

Source: https://github.com/dotmesh-io/dotmesh/blob/master/docs/dev-commands.md

Installs Go, Docker, and other necessary packages for Dotmesh development on Ubuntu 18.04. Includes Docker configuration and systemctl restarts.

```bash
# install go
snap install go --classic

# install docker
apt-get update
apt-get install     apt-transport-https     ca-certificates     curl     software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
apt-key fingerprint 0EBFCD88
add-apt-repository    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
apt-get update
apt-get install docker-ce

# configure docker
cat << EOT > /etc/docker/daemon.json
{
    "storage-driver": "overlay2",
    "insecure-registries": ["$(hostname).local:80"]
}
EOT
systemctl restart docker

# install packages
apt install zfsutils-linux jq moreutils
echo 'vm.max_map_count=262144' >> /etc/sysctl.conf
sysctl vm.max_map_count=262144

# install docker-compose
sudo curl -L https://github.com/docker/compose/releases/download/1.22.0/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose

# update hosts
cat <<EOF >> /etc/hosts
127.0.0.1 $(hostname).local
EOF

# install bazel
apt-get -y install pkg-config zip g++ zlib1g-dev unzip python git-core
curl -L -o bazel-installer.sh https://github.com/bazelbuild/bazel/releases/download/0.15.2/bazel-0.15.2-installer-linux-x86_64.sh
chmod +x bazel-installer.sh && ./bazel-installer.sh --user
```

--------------------------------

### Install Datamesh Locally

Source: https://github.com/dotmesh-io/dotmesh/blob/master/kubernetes/gke-demo.md

Download and install the Datamesh CLI locally. Ensure the binary is executable and then initialize a local Datamesh cluster.

```bash
sudo curl -o /usr/local/bin/dm \
    https://get.datamesh.io/$(uname -s)/dm
sudo chmod +x /usr/local/bin/dm
dm cluster init
```

--------------------------------

### Install mapstructure Go Library

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/mitchellh/mapstructure/README.md

Use 'go get' to install the mapstructure library. This is the standard method for obtaining Go packages.

```bash
go get github.com/mitchellh/mapstructure
```

--------------------------------

### Install go-ini/ini (Latest Changes)

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/go-ini/ini/README.md

Use this command to get the latest development version of the go-ini/ini library. Add the -u flag for future updates.

```bash
$ go get github.com/go-ini/ini
```

--------------------------------

### Install Dotmesh Client

Source: https://github.com/dotmesh-io/dotmesh/blob/master/README.md

Downloads and installs the dotmesh client binary to /usr/local/bin/dm. Ensure you have curl installed.

```plain
sudo curl -sSL -o /usr/local/bin/dm \
    https://get.dotmesh.io/$(uname -s)/dm
```

--------------------------------

### Install and Configure GitLab Runner

Source: https://github.com/dotmesh-io/dotmesh/blob/master/docs/dev-commands.md

Installs the GitLab runner binary, sets permissions, and installs it as a service. The runner is configured to run as the gitlab-runner user.

```bash
# install gitlab runner
sudo wget -O /usr/local/bin/gitlab-runner https://gitlab-runner-downloads.s3.amazonaws.com/latest/binaries/gitlab-runner-linux-amd64
sudo chmod +x /usr/local/bin/gitlab-runner
sudo gitlab-runner install --user=gitlab-runner --working-directory=/home/gitlab-runner
```

--------------------------------

### Install go-sockaddr CLI

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/hashicorp/go-sockaddr/README.md

Installs the go-sockaddr command-line utility. This tool exposes most of the library's functionality.

```bash
go get -u github.com/hashicorp/go-sockaddr/cmd/sockaddr
```

--------------------------------

### Setup Dotmesh Instrumentation

Source: https://github.com/dotmesh-io/dotmesh/blob/master/docs/dev-commands.md

Clones the dotmesh-instrumentation repository and runs its setup script. This includes setting up a local registry required for integration tests.

```bash
cd ~/ 
git clone git@github.com:dotmesh-io/dotmesh-instrumentation
cd dotmesh-instrumentation
./up.sh
```

--------------------------------

### Install Swagger Service Configuration

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/emicklei/go-restful-swagger12/README.md

Configuration for installing the Swagger service to serve the API specification. Ensure the SwaggerPath and SwaggerFilePath are set correctly for your project.

```go
config := swagger.Config{
	WebServices:    restful.RegisteredWebServices(),
	ApiPath:        "/apidocs.json",
	SwaggerPath:     "/apidocs/",
	SwaggerFilePath: "/Users/emicklei/Projects/swagger-ui/dist"}
	swagger.InstallSwaggerService(config)
```

--------------------------------

### GitLab Runner Registration Example

Source: https://github.com/dotmesh-io/dotmesh/blob/master/docs/dev-commands.md

An example of the interactive prompts and expected inputs for registering a GitLab runner. This includes providing the coordinator URL, token, description, tags, and executor type.

```bash
gitlab-runner@gitlab-dawdler:~$ sudo gitlab-runner register
Running in system-mode.

Please enter the gitlab-ci coordinator URL (e.g. https://gitlab.com/):
https://gitlab.dotmesh.com/
Please enter the gitlab-ci token for this runner:
XXX
Please enter the gitlab-ci description for this runner:
[gitlab-dawdler]:
Please enter the gitlab-ci tags for this runner (comma separated):
fast,ubuntu-bionic
Registering runner... succeeded                     runner=WyJjQ2zg
Please enter the executor: docker-ssh, parallels, shell, ssh, virtualbox, kubernetes, docker, docker-ssh+machine, docker+machine:
shell
Runner registered successfully. Feel free to start it, but if it's running already the config should be automatically reloaded!
```

--------------------------------

### Basic Diskv Usage Example

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/operator/vendor/github.com/peterbourgon/diskv/README.md

Demonstrates the simplest way to initialize and use a diskv store, including writing, reading, and erasing a key-value pair.

```go
package main

import (
	"fmt"
	"github.com/peterbourgon/diskv"
)

func main() {
	// Simplest transform function: put all the data files into the base dir.
	flatTransform := func(s string) []string { return []string{} }

	// Initialize a new diskv store, rooted at "my-data-dir", with a 1MB cache.
	d := diskv.New(diskv.Options{
		BasePath:     "my-data-dir",
		Transform:    flatTransform,
		CacheSizeMax: 1024 * 1024,
	})

	// Write three bytes to the key "alpha".
	key := "alpha"
	d.Write(key, []byte{'1', '2', '3'})

	// Read the value back out of the store.
	value, _ := d.Read(key)
	fmt.Printf("%v\n", value)

	// Erase the key+value from the store (and the disk).
	d.Erase(key)
}
```

--------------------------------

### Install govalidator Package

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/asaskevich/govalidator/README.md

Install the govalidator package using go get. You can also get a specified release using gopkg.in.

```bash
go get github.com/asaskevich/govalidator
or you can get specified release of the package with `gopkg.in`:

	go get gopkg.in/asaskevich/govalidator.v4
```

--------------------------------

### Basic Example with Logging and Compression

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/gorilla/handlers/README.md

Demonstrates how to use LoggingHandler for request logging and CompressHandler for response compression in a Go HTTP server. Requires importing the 'net/http' and 'github.com/gorilla/handlers' packages.

```go
import (
    "net/http"
    "github.com/gorilla/handlers"
)

func main() {
    r := http.NewServeMux()

    // Only log requests to our admin dashboard to stdout
    r.Handle("/admin", handlers.LoggingHandler(os.Stdout, http.HandlerFunc(ShowAdminDashboard)))
    r.HandleFunc("/", ShowIndex)

    // Wrap our server with our gzip handler to gzip compress all responses.
    http.ListenAndServe(":8000", handlers.CompressHandler(r))
}
```

--------------------------------

### Initialize Local Git Repository

Source: https://github.com/dotmesh-io/dotmesh/blob/master/kubernetes/gke-demo.md

Copy the example application, initialize a new Git repository, add all files, and create an initial commit.

```bash
cp -r example_app ~/dm_example_app
cd ~/dm_example_app
git init
git add -A
git commit -m "initial commit"
```

--------------------------------

### Install urlesc Package

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dotmesh-server/pkg/dind-dynamic-provisioning/vendor/github.com/PuerkitoBio/urlesc/README.md

Use 'go get' to install the urlesc package. This command fetches and installs the package and its dependencies.

```go
go get github.com/PuerkitoBio/urlesc
```

--------------------------------

### Configure Codec Handles and Extensions

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/ugorji/go/codec/README.md

Demonstrates how to create and configure codec handles (like Binc, Msgpack, Cbor) and set up custom extensions for specific types, such as time.Time for Msgpack.

```go
var (
      bh codec.BincHandle
      mh codec.MsgpackHandle
      ch codec.CborHandle
    )

    mh.MapType = reflect.TypeOf(map[string]interface{}(nil))

    // configure extensions
    // e.g. for msgpack, define functions and enable Time support for tag 1
    // mh.SetExt(reflect.TypeOf(time.Time{}), 1, myExt)
```

--------------------------------

### RPC Client Codec Setup

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/ugorji/go/codec/README.md

Demonstrates how to establish an RPC client connection and create a client codec using either the generic Go RPC codec or a Msgpack-specific one.

```go
//RPC Communication (client side)
    conn, err = net.Dial("tcp", "localhost:5555")
    rpcCodec := codec.GoRpc.ClientCodec(conn, h)
    //OR rpcCodec := codec.MsgpackSpecRpc.ClientCodec(conn, h)
    client := rpc.NewClientWithCodec(rpcCodec)
```

--------------------------------

### RPC Client Setup with go-codec

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/ugorji/go/codec/README.md

Demonstrates how to establish an RPC client connection using go-codec, dialing a server and creating an RPC client with either the standard Go RPC codec or Msgpack-spec RPC codec.

```Go
conn, err = net.Dial("tcp", "localhost:5555")
rpcCodec := codec.GoRpc.ClientCodec(conn, h)
//OR rpcCodec := codec.MsgpackSpecRpc.ClientCodec(conn, h)
client := rpc.NewClientWithCodec(rpcCodec)
```

--------------------------------

### RPC Server Setup with go-codec

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/ugorji/go/codec/README.md

Illustrates how to set up an RPC server using go-codec, accepting connections and serving RPC requests with either the standard Go RPC codec or Msgpack-spec RPC codec.

```Go
go func() {
        for {
            conn, err := listener.Accept()
            rpcCodec := codec.GoRpc.ServerCodec(conn, h)
            //OR rpcCodec := codec.MsgpackSpecRpc.ServerCodec(conn, h)
            rpc.ServeCodec(rpcCodec)
        }
    }()
```

--------------------------------

### Basic etcd Client Usage in Go

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/coreos/etcd/client/README.md

Demonstrates how to initialize an etcd client, create a keys API, and perform basic operations like setting and getting a key-value pair. Ensure etcd is running and accessible at the specified endpoint.

```go
package main

import (
	"log"
	"time"

	"golang.org/x/net/context"
	"github.com/coreos/etcd/client"
)

func main() {
	cfg := client.Config{
		Endpoints:               []string{"http://127.0.0.1:2379"},
		Transport:               client.DefaultTransport,
		// set timeout per request to fail fast when the target endpoint is unavailable
		HeaderTimeoutPerRequest: time.Second,
	}
	c, err := client.New(cfg)
	if err != nil {
		log.Fatal(err)
	}
	kapi := client.NewKeysAPI(c)
	// set "/foo" key with "bar" value
	log.Print("Setting '/foo' key with 'bar' value")
	resp, err := kapi.Set(context.Background(), "/foo", "bar", nil)
	if err != nil {
		log.Fatal(err)
	} else {
		// print common key info
		log.Printf("Set is done. Metadata is %q\n", resp)
	}
	// get "/foo" key's value
	log.Print("Getting '/foo' key value")
	resp, err = kapi.Get(context.Background(), "/foo", nil)
	if err != nil {
		log.Fatal(err)
	} else {
		// print common key info
		log.Printf("Get is done. Metadata is %q\n", resp)
		// print value
		log.Printf("%q key has %q value\n", resp.Node.Key, resp.Node.Value)
	}
}
```

--------------------------------

### Basic Connection Multiplexing with cmux

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/soheilhy/cmux/README.md

Demonstrates how to set up a listener, create a cmux instance, match different protocols (gRPC, HTTP, Any), and serve them concurrently using their respective servers. This is the primary usage pattern for cmux.

```go
import (
	"log"
	"net"
	"google.golang.org/grpc"
	"net/http"
	"github.com/soheilhy/cmux"
	"path/to/your/grpcs/package"
	"path/to/your/rpc/package"
)

// Create the main listener.
l, err := net.Listen("tcp", ":23456")
if err != nil {
	log.Fatal(err)
}

// Create a cmux.
m := cmux.New(l)

// Match connections in order:
// First grpc, then HTTP, and otherwise Go RPC/TCP.
grpcL := m.Match(cmux.HTTP2HeaderField("content-type", "application/grpc"))
httpL := m.Match(cmux.HTTP1Fast())
trpcL := m.Match(cmux.Any()) // Any means anything that is not yet matched.

// Create your protocol servers.
grpcS := grpc.NewServer()
grpchello.RegisterGreeterServer(grpcs, &server{})

httpS := &http.Server{
	Handler: &helloHTTP1Handler{},
}

trpcS := rpc.NewServer()
trpcS.Register(&ExampleRPCRcvr{})

// Use the muxed listeners for your servers.
go grpcS.Serve(grpcL)
go httpS.Serve(httpL)
go trpcS.Accept(trpcL)

// Start serving!
m.Serve()
```

--------------------------------

### RPC Server Codec Setup

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/ugorji/go/codec/README.md

Illustrates how to set up an RPC server codec using either the generic Go RPC codec or a Msgpack-specific one, integrating with the standard net/rpc package.

```go
//RPC Server
    go func() {
        for {
            conn, err := listener.Accept()
            rpcCodec := codec.GoRpc.ServerCodec(conn, h)
            //OR rpcCodec := codec.MsgpackSpecRpc.ServerCodec(conn, h)
            rpc.ServeCodec(rpcCodec)
        }
    }()
```

--------------------------------

### Install Cobra CLI

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/spf13/cobra/README.md

Install the latest version of the Cobra generator executable and the library using `go get`.

```bash
go get -u github.com/spf13/cobra/cobra
```

--------------------------------

### Create a KVDB Instance

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/portworx/kvdb/README.md

Demonstrates how to create a new instance of the Kvdb object, specifying the key-value store implementation, base path, discovery endpoints, and options. Includes a panic handler for critical errors.

```Go
package main

import (
  "github.com/portworx/kvdb"
  "github.com/portworx/kvdb/etcd/v3"
  "github.com/libopenstorage/openstorage/pkg/dbg"
)

func getKvdb(
  kvdbName string, // Use one of the kv store implementation names
  basePath string, // The path under which all the keys will be created by this kv instance
  discoveryEndpoints []string,  // A list of kv store endpoints
  options map[string]string, // Options that need to be passed to the kv store
  panicHandler kvdb.FatalErrorCB, // A callback function to execute when the library needs to panic
) (kvdb.Kvdb, error) {

	kv, err := kvdb.New(
		kvdbName,
		basePath,
		discoveryEndpoints,
		options,
		panicHandler,
	)
  return kv, err

}

type A struct {
   a1 string
   a2 int
}

func main() {

  // An example kvdb using etcd v3 as a key value store
  kv, err := getKvdb(
    v3.Name,
    "root/",
    []{"127.0.0.1:2379"},
    nil,
    dbg.Panicf,
  )
  if err != nil {
    fmt.Println("Failed to create a kvdb instance: ", err)
    return
  }

  // Put a key value pair foo=bar
  a := &A{"bar", 1}
  _, err = kv.Put("foo", &a, 0)
  if err != nil {
    fmt.Println("Failed to put a key in kvdb: ", err)
    return
  }

  // Get a key
  value := A{}
  _, err = kv.GetVal("foo", &value)
  if err != nil {
    fmt.Println("Failed to get a key from kvdb: ", err)
    return
  }

}

```

--------------------------------

### Using Real Clock in Production

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/jonboulle/clockwork/README.md

Illustrates how to inject the real clock implementation in production builds.

```go
my_func(clockwork.NewRealClock())
```

--------------------------------

### Build and Push Installer Image

Source: https://github.com/dotmesh-io/dotmesh/blob/master/kubernetes/gke-demo.md

Build the Datamesh Kubernetes installer Docker image. This is typically used for rebuilding images for the setup.

```bash
make k8s.installer
```

--------------------------------

### Install NATS Go Client and Server

Source: https://github.com/dotmesh-io/dotmesh/blob/master/tests/vendor/github.com/nats-io/go-nats/README.md

Installs the NATS Go client and the NATS server (gnatsd) using the go get command.

```bash
# Go client
go get github.com/nats-io/go-nats

# Server
go get github.com/nats-io/gnatsd
```

--------------------------------

### Install YAML dependency

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/imdario/mergo/README.md

If tests fail due to a missing package, execute 'go get gopkg.in/yaml.v2'.

```go
go get gopkg.in/yaml.v2
```

--------------------------------

### Install Swagger Service Configuration

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dynamic-provisioner/vendor/github.com/emicklei/go-restful/swagger/README.md

Configure and install the Swagger service to serve the API documentation. Ensure the ApiPath and SwaggerPath match your service endpoints and the SwaggerFilePath points to the downloaded Swagger UI 'dist' folder.

```go
config := swagger.Config{
		WebServices:    restful.RegisteredWebServices(),
		ApiPath:        "/apidocs.json",
		SwaggerPath:     "/apidocs/",
		SwaggerFilePath: "/Users/emicklei/Projects/swagger-ui/dist"}
	swagger.InstallSwaggerService(config)
```

--------------------------------

### Install go-ini/ini (Tagged Revision)

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/go-ini/ini/README.md

Use this command to get a specific tagged version of the go-ini/ini library.

```bash
$ go get gopkg.in/ini.v1
```

--------------------------------

### Configure Handles and Encode/Decode

Source: https://github.com/dotmesh-io/dotmesh/blob/master/cmd/dm/vendor/github.com/ugorji/go/codec/README.md

Shows how to create and configure different codec handles (Binc, Msgpack, CBOR) and use them for encoding and decoding data with readers, writers, and byte slices.

```Go
var (
      bh codec.BincHandle
      mh codec.MsgpackHandle
      ch codec.CborHandle
    )

    mh.MapType = reflect.TypeOf(map[string]interface{}(nil))

    // configure extensions
    // e.g. for msgpack, define functions and enable Time support for tag 1
    // mh.SetExt(reflect.TypeOf(time.Time{}), 1, myExt)

    // create and use decoder/encoder
    var (
      r io.Reader
      w io.Writer
      b []byte
      h = &bh // or mh to use msgpack
    )

    dec = codec.NewDecoder(r, h)
    dec = codec.NewDecoderBytes(b, h)
    err = dec.Decode(&v)

    enc = codec.NewEncoder(w, h)
    enc = codec.NewEncoderBytes(&b, h)
    err = enc.Encode(v)
```

--------------------------------

### Register GitLab Runner

Source: https://github.com/dotmesh-io/dotmesh/blob/master/docs/dev-commands.md

Registers a new GitLab runner with the specified coordinator URL, token, description, tags, and executor. This command is run after the runner is installed and started.

```bash
sudo gitlab-runner start
sudo gitlab-runner register
```

--------------------------------

### Initialize Global Tracer

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/opentracing/opentracing-go/README.md

Call this as early as possible in your main function to set up the global tracer implementation.

```go
import "github.com/opentracing/opentracing-go"
import ".../some_tracing_impl"

func main() {
    opentracing.InitGlobalTracer(
        // tracing impl specific:
        some_tracing_impl.New(...),
    )
    ...
}
```

--------------------------------

### Clone and Setup Dotmesh Repositories

Source: https://github.com/dotmesh-io/dotmesh/blob/master/docs/dev-commands.md

Clones and sets up the dotmesh-instrumentation, dotmesh, and discovery.dotmesh.io repositories. This requires SSH access to the runner and the gitlab-runner user context.

```bash
exit
exit
# you should now have accesss because we added authorized_keys
ssh gitlab-runner@<HOSTNAME-OF-RUNNER>
su - gitlab-runner

# clone & setup the dotmesh-instrumentation repo
cd ~/
git clone git@github.com:dotmesh-io/dotmesh-instrumentation
cd dotmesh-instrumentation
./up.sh

# clone the dotmesh repo
mkdir -p $GOPATH/src/github.com/dotmesh-io
cd $GOPATH/src/github.com/dotmesh-io
git clone git@github.com:dotmesh-io/dotmesh.git
cd dotmesh
./prime.sh

# clone & setup the discovery.dotmesh.io repo
cd ~/
git clone git@github.com:dotmesh-io/discovery.dotmesh.io
cd discovery.dotmesh.io
./start-local.sh
```

--------------------------------

### Run PostgreSQL with Dotmesh Datadot

Source: https://github.com/dotmesh-io/dotmesh/blob/master/README.md

Starts a PostgreSQL container, creating a datadot named 'myapp' and mounting its master branch to the container's data directory. Assumes Docker and Dotmesh are installed.

```bash
docker run -d --volume-driver dm \
    -v myapp:/var/lib/postgresql/data --name postgres postgres:9.6.6
```

--------------------------------

### Import and Use Citools in Go Tests

Source: https://github.com/dotmesh-io/dotmesh/blob/master/tests/vendor/github.com/dotmesh-io/citools/README.md

Import the citools package into your Go test files to utilize its testing utilities. This example shows basic setup for testing default dot selection.

```go
import (
  "github.com/dotmesh-io/citools"
)


func TestDefaultDot(t *testing.T) {
  // Test default dot select on a totally fresh cluster
  citools.teardownFinishedTestRuns()

  f := citools.Federation{citools.NewCluster(1)}

  citools.startTiming()
}
```

--------------------------------

### Initialize Dependencies and Add Citools

Source: https://github.com/dotmesh-io/dotmesh/blob/master/tests/vendor/github.com/dotmesh-io/citools/README.md

Use `dep init` to initialize Go dependencies and `dep ensure` to add the citools library and its dependencies.

```bash
dep init
dep ensure -add github.com/dotmesh-io/citools github.com/dotmesh-io/citools
```

--------------------------------

### Configuration Loading Logic

Source: https://github.com/dotmesh-io/dotmesh/blob/master/vendor/github.com/spf13/cobra/README.md

Implement the `initConfig` function to read configuration from a specified file or the user's home directory using Viper.

```go
func initConfig() {
  // Don't forget to read config either from cfgFile or from home directory!
  if cfgFile != "" {
    // Use config file from the flag.
    viper.SetConfigFile(cfgFile)
  } else {
    // Find home directory.
    home, err := homedir.Dir()
    if err != nil {
      fmt.Println(err)
      os.Exit(1)
    }

    // Search config in home directory with name ".cobra" (without extension).
    viper.AddConfigPath(home)
    viper.SetConfigName(".cobra")
  }

  if err := viper.ReadInConfig(); err != nil {
    fmt.Println("Can't read config:", err)
    os.Exit(1)
  }
}
```